This cake looks so amazing and I know there are lots of great vegan lemon curd recipes out there, so I'm wondering if there is a vegan cake that would be a good stand in. It's just 2 eggs in the cake, so maybe just replace them with ground chia or flax?

Hard to tell from the photo, but maybe it's a sort of short, dense cake? (I'm guessing from the almonds). I remember making this recipe from Celine's blog have cake will travel many years ago and thinking it was not ask cake-y as I'd expected, so it might be worth a try. And it does use soy yogurt, as lavawitch suggests.

Celine recommends a 6 inch pan and I'm pretty sure I used an 8 or 9 inch pan (like I said, it was long ago) and my cake was definitely shorter than the cake in her photos. But it was still soft and moist and delicious!

Torque, good call on that lemon curd from the lemon bar recipe (it's definitely in the "Vegan Cookies Invade Your Cookie Jar" book; may well be in Vcon too.) I could seriously roll around in that stuff.